<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
    <div>
      <img src="../assets/heima.png" alt="">
      <span>电商后台管理系统</span>
    </div>
    <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!-- 页面主体区域 -->
  <el-container>
    <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px':'200px'">
      <!-- 侧边栏菜单区 -->
      <div class="toggle-button" @click="toggleCollapse" >|||</div>
      <el-menu background-color="#333744" text-color="#fff" 
      active-text-color="#409EFF" unique-opened :collapse="isCollapse" :collapse-transition="false"
       router :default-active="activePath">
        <!-- 一级菜单 -->
        <el-submenu  :index="item.id + ''" v-for="item in menulist" :key="item.id" >
          <!-- 一级菜单的模板区 -->
          <template slot="title">
            <!-- 图标 -->
            <i :class="iconsObj[item.id]"></i>
            <!-- 文本 -->
            <span>{{item.authName}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">  
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
    </el-aside>
    <!-- 右侧main主体 -->
    <el-main>
      <!-- 路由占位符 -->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>
<script>
export default {
  data(){
    return{
      // 左侧二菜单数据
      menulist:[],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList(){
      const {data:res} =await this.$http.get('menus');
      if(res.meta.status !==200) return this.$message.error(res.meta.msg)
      this.menulist=res.data
      console.log(res);
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
      this.isCollapse =!this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  },
}
</script>

<style  lang="less" scoped>
.el-header{background-color: #373d41; display: flex; justify-content: space-between; padding-left: 0; align-items: center; color: #fff; font-size: 20px; 
>div{display: flex; align-items: center;
span{margin-left: 15px;}}}
.el-aside{background-color: #333744;
.el-menu{border-right:none}}
.el-main{background-color: #EAEDF1}
.home-container{height: 100%}
.iconfont{margin-right: 10px}
.toggle-button{background-color: #4A5064; color: #fff; font-size: 10px; line-height: 24px; text-align: center; letter-spacing: 0.2em; cursor: pointer;}
</style>
